Who gave this tip?
Happened June 2016.
How would Candidate Trump have known and arranged a tip?
http:// insider.foxnews.com/2016/07/01/how-was-local-reporter-tipped-clinton-lynch-meeting
Who gave this tip in June of 2016?
http:// insider.foxnews.com/2016/07/01/how-was-local-reporter-tipped-clinton-lynch-meeting
They know the tipster/leaker.
Was the POTUS tweet revealing Comey as a liar suggesting he was the tipster?
Unknown until confirmation or solid evidence is available, but I have presented the info.